#!/usr/bin/env python
# -*- coding: UTF-8 -*-
"""
"""

###
if __name__=="__main__":
    t = set("hello")
    s = set([1, 3, 5])
    
    print t
    print s
    
    print t | s
    print t & s
    print t - s
    print t ^ s
    
    t.add('x')
    print t
    
    s.update([22, 21])
    print s
    
    s.remove(22)
    print s
    
    raw_input("Press any key to continute...")